kubernetes

name	description	tags	icon
Develop in Kubernetes	Get started with Kubernetes development.	cloud kubernetes	/icon/k8s.png

Getting started

This template creates a pod running the codercom/enterprise-base:ubuntu image, with an exectrace sidecar container to log all processes started in the workspace.

RBAC

The Coder provisioner requires permission to administer pods to use this template. The template creates workspaces in a single Kubernetes namespace, using the workspaces_namespace parameter set while creating the template.

Create a role as follows and bind it to the user or service account that runs the coder host.

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: coder
rules:
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["*"]

Authentication

This template can authenticate using in-cluster authentication, or using a kubeconfig local to the Coder host. For additional authentication options, consult the Kubernetes provider documentation.

kubeconfig on Coder host

If the Coder host has a local ~/.kube/config, you can use this to authenticate with Coder. Make sure this is done with same user that's running the coder service.

To use this authentication, set the parameter use_kubeconfig to true.

In-cluster authentication

If the Coder host runs in a Pod on the same Kubernetes cluster as you are creating workspaces in, you can use in-cluster authentication.

To use this authentication, set the parameter use_kubeconfig to false.

The Terraform provisioner will automatically use the service account associated with the pod to authenticate to Kubernetes. Be sure to bind a role with appropriate permission to the service account. For example, assuming the Coder host runs in the same namespace as you intend to create workspaces:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: coder

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: coder
subjects:
  - kind: ServiceAccount
    name: coder
roleRef:
  kind: Role
  name: coder
  apiGroup: rbac.authorization.k8s.io

Then start the Coder host with serviceAccountName: coder in the pod spec.

Namespace

The target namespace in which the pod will be deployed is defined via the coder_workspace variable. The namespace must exist prior to creating workspaces.

Persistence

The /home/coder directory in this example is persisted via the attached PersistentVolumeClaim. Any data saved outside of this directory will be wiped when the workspace stops.

Since most binary installations and environment configurations live outside of the /home directory, we suggest including these in the startup_script argument of the coder_agent resource block, which will run each time the workspace starts up.

For example, when installing the aws CLI, the install script will place the aws binary in /usr/local/bin/aws. To ensure the aws CLI is persisted across workspace starts/stops, include the following code in the coder_agent resource block of your workspace template:

resource "coder_agent" "main" {
  startup_script = <<EOT
    #!/bin/bash

    # install AWS CLI
    curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
    unzip awscliv2.zip
    sudo ./aws/install
  EOT
}

code-server

code-server is installed via the startup_script argument in the coder_agent resource block. The coder_app resource is defined to access code-server through the dashboard UI over localhost:13337.